SPHERICAL SPACER The purpose of chocking is to create a perfect coplanar mounting surface for the machine. RotaChock® fills the gap between the machine foot and its foundation and solves parallel and angular misalignment. But this doesn’t mean that a hardware misalignment can’t still occur. Whether using RotaChock®, epoxy resins, or steel-fitted blocks, inadequate bolt stretch through hardware misalignment means a loose foundation bolt. In some cases, there is a hardware misalignment, as shown below.
THE PROBLEM
THE SOLUTION
In shipbuilding, classification authorities have required the underside of foundations to be spotfaced or counterbored so that the surfaces are parallel. In other industries, extra-long studs are specified. These long studs mitigate stress build-up but do not benefit the lifecycle. Why machine the foundation or mitigate the problem when you could solve it?
The Spherical Spacers accomplish two functions: creating hardware planes and bolt elongation. This solution comprises two parts with a smooth concave and convex curvature, resulting in an angular offset angle of 4°, which creates the hardware plane. The standard heights elongate the bolt and create extra clamping length.
Spherical Spacer with Matched surfaces smooth concave and convex curvature
SPHERICAL SPACER DIMENSION CHART Selecting a Spherical Spacer is easy; they are designed specifically for the foundation bolt used. Just check the bolt you are using and match this with the chart. The standard Spherical Spacers are manufactured from 42CrMo4 (DIN1.7225) and are Anti-Corrosion Enhanced for cost-effective corrosion protection. Please check page 7 for more information on the available materials and surface treatments.
Point contact
15
ROTACHOCK® INFORMATION BOOK
Outside ø
Inside ø
Height range
Standard bolt size
Reduced min. height
Weight
mm
mm
mm
M
mm
kg
SS16/18
37
19
50
16/18
20
0.2
SS20/22
46
23
50
20/22
20
0.4
SS24/27
56
28
60
24/27
28
SS30/33
67
34
60
30/33
28
SS36/39
80
40
70
36/39
34
SS42/45
93
46
70
42/45
34
Spherical Spacer
DIN 6319 with Pointx contact spherical conical cross-section
Most market-available spherical washers have a spherical x conical cross-section configuration. Due to the line contact between spherical and conical contours, these washers could prove problematic. I.eg. when your application is subject to high vibration loading, seismic shock, or marine application loading.
Matched 0.7 1.0 1.7 2.3
